Hydraulic jack.



PATENT'ED MAY 2, 1905.

I J. 0. BUSHYEAGER. HYDRAULIC JACK.

APPLICATION FILED JUNE 20, 1904 2 SHEETS-SHEET 1.

PATENTED MAY 2, 1905-. J, 0. BUSHYE'AGEB. HYDRAULIC JACK.

APPLIOATION FILED JUNE 20. 1904.

2 SHBETSSHEET 2.

day,

@Tlonggg 4 NiTnn STATES Patented May 2, 1905.

JAMES O. BUSHYEAGER, OF HAZELWVOOD, PENNSYLVANIA.

HYDRAULIC JACK.

SPECIFICATION forming part of Letters Patent No. 789,000, dated May 2, 1905.

Application filed June 20, 1904. erial No. 213,345.

1" 0 all whom, it may concern.-

Be it known that 1, JAMES O. BUSHYEAGER, a citizen of the United States of America, residing at Hazelwood, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Hydraulic Jacks, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has relation to hydraulic jacks, and relates in particular to hydraulic jacks especially adapted to remove the ends of the piston-rods of steam-engines, pumps, and other devices of like character from crossheads.

In securing the end of the piston-rod of a steam-engine,- pump,- or other similar apparatus to a cross-head the cross-head is usually shrunk upon the end of a piston-rod and keys are passed through the holes in the piston-rod and the cross-head, so as to secure a positive and rigid attachment between the cross-head and the piston-rod. The piston-rods being thus firmly secured in position are, evenafter the keys have been taken out, exceedingly difficult to remove from the cross-head, and my improved hydraulic jack is constructed with a view to performing this work speedily and effectively and without marring or injuring the cross-head or the end of the piston-rod.

My invention consists in the novel construction, combination, and arrangement of parts hereinafter described and claimed.

In the accompanying drawings, illustrating my invention, Figure 1 is a vertical sectional view through the center of a hydraulic jack constructed according to my invention. Fig. 2 is a transverse sectional view on the line 00 w of Fig. 1. Fig. 3 is a fragmentary sectional view of a portion of the jack shown in Fig. 1. Fig. 4 is a plan view, partly in section, of the cross-head, the-guide-bar on which the crosshead is supported, and the piston-rod of a steam-engine of a well-known type and with my improved jack in position on the crosshead which it occupies in operation. Fig. 5

isa transverse sectional view on the line m of Fig. 4. Figs. 6 and 7 are enlarged perspective views of wedges wh1ch I em ploy to secure its inner end, which is secured in position by an annular plate 4 and screws 5. The ramcylinder 2 is connected by a hollow sleeve 6, which constitutes a cylinder for the piston of the jack and which is formed with an annular flange 7, that is screw-threaded on its outer edge and screws into the ram-cylinder 2. Abutments 8 8 are formed on the top of the flange 7 these abutments serving, with the aid of wedges, as will be hereinafter described, to prevent the ram from turning in the crosshead. The upper end of the hollow sleeve 6 is screw-threaded and screws into a fluid-receptacle 9, which serves to contain the fluid by means of which the ram is operated. A link 10 is pivotally attached at 11 to the fluidreceptacle 9, and the said link is pivotally attached at 12 to a lever 13, which in turn is pivotally attached at 1A to a head 15, carried by the piston-rod 16 of the ram, the said lever 13 having a handle 17 on its end, by means of which it is manipulated.

The piston rod 16 is hollow and passes through a stuffing-box 18 on the end of the fluid-receptacle 9. and the said piston-rod carries near its bottom a washer 19, that works in the sleeve 6 and performs the function of a piston. A cone-shaped valve 20 its in a seat 21 on the inside of the hollow piston-rod near the bottom thereof, and the valve is impelled upwardly by a spring 22, which rests on a perforated plate 23, that is sustained in position in the piston-rod by a flanged ring 24. At one side of the bore of the sleeve 6 a concave recess 25 is formed, this recess serving as a by-path for the fluid when the end of the piston-rod 16 is depressed to its lowest position. A conical valve 26 fits a seat 27, formed in the lower end of the hollow sleeve 6, the said valve being forced to its seat by a spiral spring 28, the said spring resting on a perforated disk 29, that is seated in a screw-thread ed open-ended cap 30, which screws into a recess in the bottom of the flange 7 below the bore of the hollow sleeve 6. The ram-cylinder 2 and the fluid-receptacle 9 are cylindrical in form and of such size that they fit the opening 31 in the cross-head 32, into which the piston-rod 33 projects when the piston-rod is in position in the cross-head, and the hollow sleeve 6 being of less diameter than the receptacle 9 and the ram-cylinder 2 provides a space in the opening 31, into which are forced wedge-shaped keys 34 35, that serve to sustain the jack in position in the cross-head during the operation of removing the pistonrod, these keys bearing against the abu tments 8 on the flange 7 and preventing the jack from turning in the cross-head. The fluid for the operation of the jack is contained in the fluidreceptacle 9 and finds its way into the ramcylinder through the port 36 in the side of the hollow piston-rod 16, around the valves 20 and 26 into the space behind the ram 1.

In operation the jack is placed in the crosshead in the position shown in Fig. 4, and the lever 13 being reciprocated the fluid at each upward movement of the lever will pass through port 36 and past the valve 20 into the space below the same, and at each opposite movement of the lever 13 the fluid will be forced-past the valve 26 into the space behind the head of the ram, and this operation being continued the ram 1, which bears on the end of the piston-rod 33 and is of the same or less diameter than 'the piston rod, will force the latter out of the cross-head. I/Vhen the piston-rod has been forced out of the cross-head, the lever 13 is moved to such position that the washer 19 will register with the recess 25, at which position of parts the valve 26 will be forced open by contact with the ring 24 and the fluid in the ram-cylinder will be allowed to flow past the valve 26 and, passing the washer 19 by way of the recess 25, will flow back into the receptacle-9 through intermediate portion being of less diameter than the ram-cylinder and the fluid-receptacle, and said diminished portion being adapted for the passage of keys to secure the jack in a cross-head.

2. In a hydraulic jack, the combination of a ram-cylinder, a hollow sleeve constituting a piston-cylinder, a fluid-receptacle, a ram working in said ram-cylinder, and a piston working in said piston-cylinder, the ram-cylinder and fluid-receptacle being of greater diameter than the piston-cylinder, and being adapted to fit into an opening in a cross-head and be secured therein by keys laid alongside the piston-cylinder.

3. The combination in a hydraulic jack, of a ram-cylinder, a hollow sleeve, a flange carried on said hollow sleeve and secured to the ram cylinder, abutments carried by said flange, and a water-receptacle screwing on the end of said hollow sleeve, a ram arranged in said ram-cylinder and a piston working in said hollow sleeve.

4:. A hydraulic jack of cylindrical form having a central portion of diminished diameter in combination with keys adapted to fit in the diminished portion of the jack and retain the same in an opening of the same diameter and contour as the major portion of the jack.

In testimony whereot'I aflix my signature in the presence of two witnesses.

JAMES o. BUSHYEAGER.

Witnesses:

E. E. POTTER, K. H. BUTLER. 

